Measurements of the suppression and correlations of dijets in Xe+Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV

The ATLAS collaboration
Phys.Rev.C 108 (2023) 024906, 2023.

Abstract (data abstract)
A measurement of the suppression and correlations of dijets is performed using 3~$\mu$b$^{-1}$ of Xe+Xe data at $\sqrt{s_{\mathrm{NN}}} = 5.44$~TeV collected with the ATLAS detector at the LHC. Dijets with jets reconstructed using the $R=0.4$ anti-$k_t$ algorithm are measured differentially in jet $p_{\text{T}}$ over the range of 32~GeV to 398~GeV and centrality of the collision. Significant dijet momentum imbalance is found in the most central Xe+Xe collisions, which decreases in more peripheral collisions. Results from the measurement of per-pair normalized and absolutely normalized dijet $p_{\text{T}}$ balance are compared with previous Pb+Pb measurement at $\sqrt{s_{\mathrm{NN}}} =5.02$~TeV. The differences between the dijet suppression in Xe+Xe and Pb+Pb are further quantified by the ratio of pair nuclear modification factors. The results are found to be consistent with those measured in Pb+Pb data when compared in classes of the same event activity and when taking into account the difference in the centre-of-mass energy of the initial parton scattering process between Xe+Xe and Pb+Pb collisions. These results provide a better understanding of the role of energy density, system size, path-length, and fluctuations in the parton energy loss.

  • Table 1

    Data from Table 1

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    The centrality intervals in Xe+Xe collisions and their corresponding TAA with absolute uncertainties.

  • Table 2

    Data from Table 2

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    The centrality intervals in Xe+Xe and Pb+Pb collisions for matching SUM ET FCAL intervals and respective TAA values for Xe+Xe...

  • Figure 1a

    Data from Figure 1

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    The performance of the jet energy scale (JES) for jets with $|y| < 2.1$ evaluated as a function of pT_truth...

  • Figure 1b

    Data from Figure 1

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    The performance of jet energy resolution (JER) for jets with |y| < 2.1 evaluated as a function of pT_truth in...

  • Figure 2a

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    The relative magnitude of systematic uncertainties for per-pair normalized xJ distributions in 0-10% Xe+Xe centrality

  • Figure 2b

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    The relative magnitude of systematic uncertainties for absolutely normalized xJ distributions in 0-10% Xe+Xe centrality

  • Figure 2c

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    The relative magnitude of systematic uncertainties for rho distributions for leading jets in 0-10% Xe+Xe centrality

  • Figure 3a

    Data from Figure 3a

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    Per-pair normalized xJ distribution evaluated in four centrality intervals and given pT1 interval.

  • Figure 3b

    Data from Figure 3b

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    Per-pair normalized xJ distribution evaluated in four centrality intervals and given pT1 interval.

  • Figure 3c

    Data from Figure 3c

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    Per-pair normalized xJ distribution evaluated in four centrality intervals and given pT1 interval.

  • Figure 4a

    Data from Figure 4a

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    Absolutely normalized xJ distribution evaluated in four centrality intervals and given pT1 interval.

  • Figure 4b

    Data from Figure 4b

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    Absolutely normalized xJ distribution evaluated in four centrality intervals and given pT1 interval.

  • Figure 4c

    Data from Figure 4c

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    Absolutely normalized xJ distribution evaluated in four centrality intervals and given pT1 interval.

  • Figure 5a XeXe

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    Per-pair normalized xJ distribution in Xe+Xe collisions.

  • Figure 5a PbPb

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    Per-pair normalized xJ distribution in Pb+Pb collisions.

  • Figure 5b XeXe

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    Per-pair normalized xJ distribution in Xe+Xe collisions.

  • Figure 5b PbPb

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    Per-pair normalized xJ distribution in Pb+Pb collisions.

  • Figure 5c XeXe

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    Per-pair normalized xJ distribution in Xe+Xe collisions.

  • Figure 5c PbPb

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    Per-pair normalized xJ distribution in Pb+Pb collisions.

  • Figure 6a XeXe

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    Absolutely normalized xJ distribution in Xe+Xe collisions.

  • Figure 6a PbPb

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  • Figure 6b XeXe

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    Absolutely normalized xJ distribution in Xe+Xe collisions.

  • Figure 6b PbPb

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  • Figure 6c XeXe

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    Absolutely normalized xJ distribution in Xe+Xe collisions.

  • Figure 6c PbPb

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  • Figure 6d XeXe

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    Absolutely normalized xJ distribution in Xe+Xe collisions.

  • Figure 6d PbPb

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  • Figure 6e XeXe

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    Absolutely normalized xJ distribution in Xe+Xe collisions.

  • Figure 6e PbPb

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  • Figure 6f XeXe

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    Absolutely normalized xJ distribution in Xe+Xe collisions.

  • Figure 6f PbPb

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  • Figure 7a

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    The ratios of Xe+Xe and Pb+Pb pair nuclear-modification factors, rho, evaluated as a function of leading jet pT in the...

  • Figure 7b

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    The ratios of Xe+Xe and Pb+Pb pair nuclear-modification factors, rho, evaluated as a function of leading jet pT in the...

  • Figure 7c

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    The ratios of Xe+Xe and Pb+Pb pair nuclear-modification factors, rho, evaluated as a function of leading jet pT in the...

  • Figure 7d

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    The ratios of Xe+Xe and Pb+Pb pair nuclear-modification factors, rho, evaluated as a function of subleading jet pT in the...

  • Figure 7e

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    The ratios of Xe+Xe and Pb+Pb pair nuclear-modification factors, rho, evaluated as a function of subleading jet pT in the...

  • Figure 7f

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    The ratios of Xe+Xe and Pb+Pb pair nuclear-modification factors, rho, evaluated as a function of subleading jet pT in the...

  • Figure 8a

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    The ratios of Xe+Xe and Pb+Pb pair nuclear-modification factors, rho, evaluated as a function of leading jet pT in the...

  • Figure 8b

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    The ratios of Xe+Xe and Pb+Pb pair nuclear-modification factors, rho, evaluated as a function of leading jet pT in the...

  • Figure 8c

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    The ratios of Xe+Xe and Pb+Pb pair nuclear-modification factors, rho, evaluated as a function of leading jet pT in the...

  • Figure 8d

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    The ratios of Xe+Xe and Pb+Pb pair nuclear-modification factors, rho, evaluated as a function of subleading jet pT in the...

  • Figure 8e

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    The ratios of Xe+Xe and Pb+Pb pair nuclear-modification factors, rho, evaluated as a function of subleading jet pT in the...

  • Figure 8f

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    The ratios of Xe+Xe and Pb+Pb pair nuclear-modification factors, rho, evaluated as a function of subleading jet pT in the...

  • JER Fit Parameters

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    Parameter a,b, and c from JER fits in Figure 1b.

  • Figure 10a XeXe 100-126 GeV

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    Per-pair normalized xJ distribution in Xe+Xe collisions for selected Pb+Pb centrality and pT1 bin.

  • Figure 10a PbPb 100-126 GeV

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  • Figure 10b XeXe 100-126 GeV

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    Per-pair normalized xJ distribution in Xe+Xe collisions for selected Pb+Pb centrality and pT1 bin.

  • Figure 10b PbPb 100-126 GeV

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  • Figure 10c XeXe 100-126 GeV

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    Per-pair normalized xJ distribution in Xe+Xe collisions for selected Pb+Pb centrality and pT1 bin.

  • Figure 10c PbPb 100-126 GeV

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  • Figure 10d XeXe 126-158 GeV

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    Per-pair normalized xJ distribution in Xe+Xe collisions for selected Pb+Pb centrality and pT1 bin.

  • Figure 10d PbPb 126-158 GeV

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  • Figure 10e XeXe 126-158 GeV

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    Per-pair normalized xJ distribution in Xe+Xe collisions for selected Pb+Pb centrality and pT1 bin.

  • Figure 10e PbPb 126-158 GeV

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  • Figure 10f XeXe 126-158 GeV

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    Per-pair normalized xJ distribution in Xe+Xe collisions for selected Pb+Pb centrality and pT1 bin.

  • Figure 10f PbPb 126-158 GeV

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  • Figure 10g XeXe 158-199 GeV

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    Per-pair normalized xJ distribution in Xe+Xe collisions for selected Pb+Pb centrality and pT1 bin.

  • Figure 10g PbPb 158-199 GeV

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  • Figure 10h XeXe 158-199 GeV

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    Per-pair normalized xJ distribution in Xe+Xe collisions for selected Pb+Pb centrality and pT1 bin.

  • Figure 10h PbPb 158-199 GeV

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  • Figure 10i XeXe 158-199 GeV

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    Per-pair normalized xJ distribution in Xe+Xe collisions for selected Pb+Pb centrality and pT1 bin.

  • Figure 10i PbPb 158-199 GeV

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